TCP/IP Tutorial and Technical Overview - IBM Redbooks

► Network infrastructure and service management: Peer-to-peer (P2P) network
applications are available to flood the Internet. However, there is a lack of
network and service management and control capability. While we should
maintain the access and openness of the Internet, the business and
commercial reality in the IP space require fundamental rethinking about
network and service management infrastructure support.
► Security: In addition to the native security functions supplied in IPv6
protocols, IPv6 network security architecture needs to define how to extend
security across upper layers of IP networks:
– An integrated security infrastructure combines application security policies
to underlying network security capabilities.
– An integrated security infrastructure also combines content protection into
a distribution and transport security layer.
► Real-time control capability: IPv6 quality of service features provide real-time
support of voice and multimedia applications. Additional research topics
include signaling and integration with IP multimedia subsystems.
► IPv6 network virtualization: Automatic configuration inventory and
provisioning capabilities have to be studied in order to allocate networking
resources and transport on demand.
9.8 Internet transition: Migrating from IPv4 to IPv6
If the Internet is to realize the benefits of IPv6, a period of transition will be
necessary when new IPv6 hosts and routers are deployed alongside existing
IPv4 systems. RFC 2893 – Transition Mechanisms for IPv6 Hosts and Routers
and RFC2185 – Routing Aspects of IPv6 Transition define a number of
mechanisms to be employed to ensure both compatibility between old and new
systems and a gradual transition that does not impact the functionality of the
Internet. These techniques are sometimes collectively termed Simple Internet
Transition (SIT). The transition employs the following techniques:
► Dual-stack IP implementations for hosts and routers that must interoperate
between IPv4 and IPv6.
► Imbedding of IPv4 addresses in IPv6 addresses. IPv6 hosts will be assigned
addresses that are interoperable with IPv4, and IPv4 host addresses will be
mapped to IPv6.
► IPv6-over-IPv4 tunneling mechanisms for carrying IPv6 packets across IPv4
router networks.
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